In order to have the best chance to get into selective colleges, taking the most rigorous curriculums your school offers is important. Within those curriculums, it’s important to have 4 years of English with AP English Lang and AP English Lit or the equivalent to those two at a college if you have access to one, as you do. 4 years of Mathematics with AP Calculus or college level calculus is Aldo very important. 3 -4 years of the sciences, with one AP or college level one after taking the Holy Trilogy (Bio, Chem, Physics) at high school level, 3 years of a history or Socisl studies, at the highest level possible. For my kids that was AP World, APUSH, APGovernment and/or European history Then There is Usually a recommendation for 4 years of one Foreign Language with the fourth year being APLev Again, one can replace the APs with college courses. Do note that the courses are very basic academic. That’s what the colleges like. Don’t fill up on off the path college courses if you are allowed Dual Enrollment. That’s where si see a lot of kids go astray,. They go off that well beaten path taking what they think are unusual, different, impressive courses. You want to take a couple of them, fine. They should be in ADDITION to the fundamental ones, not instead.
The prescribed courses above do not have to be followed exactly in order to get into a selective school. Yes, there is leeway. But like baking a cake, the closer you stay to the recipe, the closest to the ideal result. You can add garnishes, decor, change the flavor up, but staying with the basic ingredients is key, … unless you are such a master chef that you can make masterpiece. Most of us stick to the recipe.
So, the important thing for you is to follow a path like that as closely as you can. Don’t get distracted by Geology 101, Archaeology 100, etc etc.
In your case, being in CA, looking at the UC and Cal State formulas would be a very good idea. They are not far off from the basic guidelines, Imo.
It’s important to get good grades—sounds obvious, right? But it’s even more important when you take college courses because they will be part of your college record instead of being flushed once you go off to college like most high school courses. When you apply to med school, grad school, law school, those dual enrollment will be included with the grades you got. As a high schooler.
So pick solid academic courses, do your best in them, study for the tests needed for college admissions. Khan Academy or some other test prep. There will College choices for you.